Locomotive-boiler



vhea-ti11g-surface is attained relativelyto the orfire-bridge interposedbetween the combustion- To a/ZZ whom it may concern,.-

4ers, of which improvements the following is a led'and issued to meunder dates of July 3,

.fuels,v (such as bituminous coals of various descriptions,) which areanalogous thereto in the UMTED ASTATES' RAieNr PrienrocoMoTivE-BOILER.

SPECIFICATION forming part of Letters Patent Nuo. 291,120, dated January1, 1884.

' Application filed August 23, 1883. (No modul.)

Be it known that I, JOHN E. W'OOTTEN, of the city and county ofPhiladelphia, in the State of Pennsylvania, have invented certain newand useful Improvements in Locomotive-BML specification.

My improvements more particularly relate to locomotiveboilers of theclass in which a material increase of grate area and re-box dinaryconstruction by the provision of a rebox,which is located .above andextended laterally beyond the driving-Wheels, and which is combined witha combustion-chamber and a chamber and theiire-box. -Said features arefully exemplified in Letters Patent of the United States Nos.192,725 and254,581., grantV 1877-, and March 7, 1882, respectively.

vrllheobject of my present invention is to afford improved facilitiesfor the effective and economicaly combustionv of lignite and otherparticular of readily permitting the separation of small and light'particles 4from the larger masses or fragments in which they aredelivered for con sumpt ion, 'when burned under a forced blast, eventhoughthe latter may be comparatively mildA in degree. v

To this end my improvements consist in a table or repositorylocated'atthe forward end of fire-box andextending transversely to thesame, the `upper surface'of said table being located above the endfofthe grate, the rear end of the table being closed between its uppersurface and the level of the'grate, and said table being adapted toreceive and sustain light particles of fuel that may be lifted from themass upon the grate by the action of the draft also, in a table orrepository located on and support-ed by the forward portion of theiiregrate of a locomotiveboiler; also, in a table orrepository composedo'f one or a series of sections of iirefbrick, tile, or othersufliciently refractory material,built into the forward portion of thefire-box of a locomotive-boiler, and supported by the grate thereof;also, in the combination of alaterally-extended fire-box, a fire-bridge,and a transverse table or repository extending rearwardly from saidfire-bridge across the Jreloox.`

The improvements claimed arc hereinafter more fully set forth. l

In the accompanying drawings, Figure lis avertical longitudinal centralsection through a locomotive-boiler embodying myinvention; Fig. 2,ahorizontal longitudinal section through the same at the line w x ofFig. 1,' and Fig. 3 a 'I vertical transverse section vat the line y y ofvlfy improvements are hercingillustrated and will be described asapplied in a locomotiveboiler similar to that of my Letters Patent No.

254,581, aforesaid. The waist or barrel A of the boiler is fitted with aseries of lire-tubes, df

can be conveniently located about midway of thelength ofthe boiler orotherwise, if desired,

and the smoke-box A is provided with a stack, A4, of any preferredconstruction. The fire- 'box B is located entirely above the drivingwheels, and is extended laterally beyond vthe driving-wheels tov anydesired extent within the greatest width admissible for passage o verthe road..A It is, asl usual, furnished `with a proper grate, b',furnace-doors b2, and ash-pans b3, the latter suitably arrangedrelatively to the engine-frame and driving-axles.

Under my present invention, I provide a vtable or repository, C, whichmay be either horizontal or inclined iny or about in correspondence withthe inclination of the fire-grate b', and which extends across there-box Bimmediately inrrear of the fire-bridge a2, above the surface ofand preferably supported upon the forward portion of the fire-grate, andhaving its rear end closed between its top and the level of the grate,said table or repository thus presenting upon its upper side asubstantially impcrforate surface, which is adapted to receive andsustain particles of the fuel which may from time to time be lifted bythe action of the exhaust from the mass of fuel in combustion upon thegrates, as well as to serve as the lower I under certain conditions ofservice, be found boundaryof a space within the firebox,\vhieh fulfillsin agreatmeasurcthefunction of a combastion-chamber for the gases. Thetendency of such separated particles of fuel to be carried over thelire-bridge and into the combustionchamber A2 and tubes, whichordinarily obtains, is, bythe provision of the table C, substantiallynullified, and such particles, after yielding the heat duc to theircombustible elcments, remain upon the table, and may be removedtherefrom at pleasure or convenience. It will be obvious that it is notdesigned nor desirable that fuel should be fired upon the table C; butif any portion of the fuel be accidentally projected on the table, itsfunction will not thereby be interfered with. The height of the tableabove the surface of the grate should be sufiicient to obviate suchtendency for fuel to be thrown upon it with proper firing, and inpracticeits upper surfaceis located above the surface of the grate at orabout the ordinary level ofthe bed ot' fuel carried thereon. In theinstance shown the table C rests and is supported directly on the top ofthe grate. which, for simplicity and convenience and economy ofconstruction, I deem more desirable than supporting it separatelytherefrom. The latter plan may, however, be adopted, if preferred, itbeing essential in such case that no opening should be permitted toexist at its rear end between its lower side andthe top of the grate.The table G is b v preference formed of a tile or a series of bricks,tiles, or sections of fire-clay or other sufiicientlyrefractorymateriahwhich maybe builtinto the front end of the fire-box,so as to form a continuous body therein, extending from the back of thelire-bridge over a greater or less portion ofthe area of the grate, asregulated by the characteristics of the particular fuel employed.

It has been found in practice, with engines having an area of fire-boxon line of grate of about seventy-six square feet, that with some fuelsa table covering ten percent. of the length of the grate iseflicienuwhereas with other fuels a tablehas been employed covering asmuch as twenty-tive per cent. of the length of the grate. It may,however,with certain fuels or advisable to extend thc table over agreater fraction of the length of thc grate than that last mentioned.

A table constructed and supported as before set forth is ofcomparatively slight cost, and can be readily andl expeditiouslyinserted, repaired, or removed whenever required.

The application of my improvements is inexpensive, as it involves nochanges in the fire-box proper, and their practice with fuels of thedescription hereinbefore referred to has been characterized by entirefreedom in steaming without undue labor in firing, and with a materialreduction of the emission of smoke and light cinders from the stack.

I claim as my invention and desire to secure by Letters Patentl. A tableor repository located transversely to the lire-box of alocomotive-boiler at the front end7 and covering the forward portion ofthe grate thereof, the rear end of said table being closed from its topto lthe surface of the grate, and its upper surface being located abovethe surface of the grate at or about thc ordinary level of thebed offuel thereon', substantially as set forth.

2. A table or repositorylocated on and supported by the forward portionof the grate of a locomotive-boiler, its upper surface being locatedabove the surface of the grate at or about the ordinary level of the bedof fuel thereon, substantially as set forth.

3. A table or repository constructed substantially as described,composed of one or a series of tiles.bricks, or sections of refractorymaterial, built-into the forward portion ofthe fire-box of alocomotive-boiler, and supported bythe grate thereof, substantially asset forth.

4. lThe combination, in a locomotive-boiler, of a laterally-extendedfire-box, a fire-bridge, and atable or repository extending rearwardlyfrom said tire-bridge and across the fire-box, substantially as and forthe purpose set forth.

JOI-IN E. WOOTT EN. Witnesses:

J. SxowDEx BELL, .Trims M. Lxxms.

